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Bifunctional interface modification for efficient and UV-robust α-Fe2O3-based planar organic–inorganic hybrid perovskite solar cells

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Abstract

Organic–inorganic hybrid perovskite solar cells (PSCs) have become the front runner among the next-generation thin-film photovoltaic technology due to their rapid great improvements in photovoltaic performance. The improvement of PSCs mainly focuses on their power conversion efficiency (PCE) and ambient stability. α-Fe2O3 has been demostrated as one promising electron transport material in planar n-i-p PSCs, which exhibit much higher ultraviolet (UV) light stability compared to TiO2-based devices. However, both energetic mismatch and numerous hydroxyl species on α-Fe2O3 surface are dentrimental to the charge transfer and collection in PSCs. Herein, we have engineered the α-Fe2O3 electron transport layer (ETL)-perovskite interface via lead iodide (PbI2)-assisted bifunctional modification. The surface hydroxyl groups could be effectively diminished by coordination with PbI2 accompanied with the formation of Fe–O-Pb bonds. It was found that the decreased -OH groups were beneficial to suppressing J-V hysteresis and improving interfacial alignment of energy levels. Meanwhile, numerous intrinsic iodine vacancies at the perovskite crystal surface could be compensated by the excess I− from PbI2, thereby reducing interfacial non-radiative recombination. Consequently, compared with reference devices, α-Fe2O3/PbI2 devices achieved a noticeable improvement of average PCE with attenuated J-V hysteresis. More importantly, α-Fe2O3/PbI2 devices exhibited significantly improved UV and shelf-life stabilities. Furthermore, compared with the CH3NH3PbI3-based device, a higher PCE of 19.32% was achieved for the device assembled with a Cs0.05(FA0.83MA0.17)0.95Pb(I0.83Br0.17)3 perovskite active layer. Overall, this work provided a facile PbI2-assisted interface modification strategy for boosting the efficiency and stability of α-Fe2O3-based planar PSCs.

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Funding

This work was financially supported by the National Key R&D Program of China (2018YFE0103500), National Natural Science Foundation of China (no. 61965010), the Start-up Research Foundation of Hainan University (KYQD(ZR)1906), Hainan Provincial Natural Science Foundation of China (420RC523).

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  1. School of Materials and Energy, University of Electronic Science and Technology of China, Chengdu, 611731, China

    Ying Guo & Hongcai He

  2. State Key Laboratory of Marine Resource Utilization in South China Sea, Hainan University, Haikou, 570228, China

    Tao Liu & Ning Wang

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Guo, Y., Liu, T., He, H. et al. Bifunctional interface modification for efficient and UV-robust α-Fe2O3-based planar organic–inorganic hybrid perovskite solar cells. Adv Compos Hybrid Mater 5, 3212–3222 (2022). https://doi.org/10.1007/s42114-022-00484-5

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